Arduino for STM32

Thanks I have sorted the 'dfu' problem. - I had 2 x USB A - C cables that look the same. However, one has only 2 pins wired through and is a charge cable, the other has all the pins wired through and is a charge and data cable! I now have a second issue. Whereas the PC detects the 'dfu' as 'STM32 Bo...

I also have a couple of these unbranded Blackpills. (Black PCB, LED on PC13, 3 oval buttons on top and no logo on the botom side just a white box.) I can program it using an ST-Link V2 in SWD ok. However, it is not detected as a DFU device neither by DFUSE-Demo v3.06 nor STM32CuBEProg. I do not see ...